You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What kind of service do you require from us?

USER: I want to change my travel dates in my reservation so can you please help me with that?

ASSISTANT: Yes, I will definitely help you with that. Can I have your full name to check your ticket status?

USER: Thank you for your response, my name is Amanda Davis.

ASSISTANT: When I have check in our portal, I have found your previous reservation. Can you please tell me which changes do you want me to do?  Please tell me the travel dates.

USER: I want to take off on Apr 19 and book my return ticket also on Apr 21.

ASSISTANT: Ok, please tell me your genesis and terminus airfield codes?

USER: I want to fly from MSP and destination airport is HOU.

ASSISTANT: Ok, please tell me your requirements about the connections.

USER: I will prefer direct flight.

ASSISTANT: Ok, do you have any specific timings to depart and return?

USER: No.

ASSISTANT: I am really sorry to tell you that, there are no direct flights found in this route with the dates you have given.

USER: Oh! It's ok, no problem. Thank you for your information.

ASSISTANT: You are most welcome. Thank you for choosing us.