You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: My name is Katherine Taylor.

ASSISTANT: Nice to meet you Katherine. What type of help can I do for you?

USER: I want to book a ticket from IAH to DFW.

ASSISTANT: Sure, may I know your trip dates?

USER: The journey dates are from 03/28 to 03/30.

ASSISTANT: OK, please wait for a minute.

USER: Sure.

ASSISTANT: Sorry Katherine, I cannot found any flight with your details.

USER: That's OK. Thank you for your details.

ASSISTANT: Thanking you for contacting us.