You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Betty Martinez.

ASSISTANT: Betty, how may I assist you today?

USER:  I am planning to join my child in school, which is situated in Seattle. can you please help me to book my ticket from IAH to SEA?

ASSISTANT: Sure, may I know your trip dates?

USER: My travelling dates are 02/26 and 02/28.

ASSISTANT: Ok, wait for a moment.

USER: Ok.

ASSISTANT: Sorry to say that, no flights as per your requirements.

USER: It's ok, thank you for your help.

ASSISTANT: It's my pleasure.