You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Nancy Walker, can you help me to book a flight from IAD?

ASSISTANT: Sure, on which dates you want to travel?

USER: My travelling dates are 10/24 and 10/26.

ASSISTANT: Ok, may I know your destination code to proceed further?

USER: My preferred destination airport code is HOU.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: May I know your connection preference?

USER: I want 1 connection.

ASSISTANT: Sorry to say, no flights were available on your dates.

USER: That is fine, no issues.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Thank you for your help.