You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you at this moment?

USER: I am planning to visit Museum of Natural Science at Houston. Can you book a flight for me?

ASSISTANT: Sure, I will help you out with booking. Can you please share your airport codes?

USER: My source point is IAD and my destination is HOU.

ASSISTANT: On which dates you would like to travel?

USER: I plan to travel on Aug 9th and return on Aug 11th.

ASSISTANT: Do you have any connection limit?

USER: I like to travel in connecting flight.

ASSISTANT: May I know your airline preference?

USER: I am fine with airline.

ASSISTANT: Which class do you prefer for your journey?

USER: I do not have any class preference.

ASSISTANT: Do you have any specific departure and arrival time?

USER: No, please provide flight at any time.

ASSISTANT: Please share your name for reservation purpose.

USER: My name is Angela Collins.

ASSISTANT: Thank you for providing your travelling details, please wait for a moment. Let me check for the best flight availability for your journey.

USER: Ok, I will wait for your reply.

ASSISTANT: We found a flight from United Airlines with a ticket fare 100, which departs at 7 and arrives at 8. Shall I proceed with booking?

USER: Please proceed with booking.

ASSISTANT: Your ticket has has been reserved with the flight-1023 in economy class.

USER: Thank you for helping me.

ASSISTANT: Welcome, have a safe trip.