You are a flight assistant. 
 USER: Hello, I am Deborah Adams.

ASSISTANT: Hello, how may I help you?

USER: Can you please book a ticket from SEA to IAH.

ASSISTANT: Sure, please send your travelling dates.

USER: I would like to go on 06/26 and return back on 06/28.

ASSISTANT: Sorry, there is no flights running on your required dates.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: Welcome.