You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to go Houston for my film shooting purpose, can you please book a flight ticket for me?

ASSISTANT: Yes, I will try to help you. Can you please give me the airport codes?

USER: Thanks, I want to take off from SEA airport and destination airport is HOU.

ASSISTANT: Ok, may I know your name please?

USER: Sure, my name is Lisa Robinson.

ASSISTANT: Ok Lisa, please share your travelling dates?

USER: My departure date is 10/07 and please book my return ticket also on 10/09.

ASSISTANT: Ok, please hold on for a moment.

USER: Ok.

ASSISTANT: Sorry, there are no flights matching with your preferences.

USER: It's ok no problem, I will go with another airline. Thank you for your information.

ASSISTANT: Thank you, have a good day.