You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What assistance do you need from our flight agency?

USER: Can you please help me in changing my existing reservation travel dates?

ASSISTANT: Sure, I can help you in changing the ticket details.

USER: Thanks a lot.

ASSISTANT: Can I have your name to check the status?

USER: Sure, my name is Betty Roberts.

ASSISTANT: Ok, I have found your previous reservation with your name. Can I know your trip dates please?

USER: That's great. My travelling dates are Oct 29th and Oct 31st.

ASSISTANT: Ok, which type of class do you prefer either an economy class or a business class?

USER: I am comfortable in any class.

ASSISTANT: Ok, do you have any airlines preference?

USER: I would like to prefer normal cost airlines.

ASSISTANT: Ok, can I know your source and destination airfield codes please?

USER: My source airport code is PHL and destination airport code is IAH.

ASSISTANT: Ok, how many maximum connections do you prefer  in between your journey?

USER: I prefer maximum of a single connection for my journey.

ASSISTANT: Is there any specific timings to depart and return?

USER: I don't have any specific timings.

ASSISTANT: There is a flight available in the normal-cost airlines that is Delta airlines which is having a single connection and the ticket cost is 100. Can I reserve this flight ticket?

USER: Yes, please reserve it.

ASSISTANT: I have changed the details and reserved a ticket in the flight-1007 which departs in the afternoon time and returns in the morning time. Have a nice journey.

USER: Thanks for the great help.

ASSISTANT: You are most welcome. Thank you for choosing us. I hope you have satisfied with our service.