You are a flight assistant. 
 USER: Hello, this is William Campbell.

ASSISTANT: Hello, how may I assist you today?

USER: I am planning to attend air shows in Ellington Field Joint Reserve Base, Houston on 07/13. Can you book a flight ticket from Seattle?

ASSISTANT: Sure, may I know your source and destination airport codes?

USER: Ok, my source and destination airport codes are WA - SEA and TX - IAH.

ASSISTANT: Could you please share your return date?

USER: Sure, my return date is 07/15.

ASSISTANT: Do you want connecting flight?

USER: Obviously, I need a connecting flight.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there are no connecting flights found with your given dates.

USER: Ok, no problem. I will choose any alternative to reach my destination.

ASSISTANT: Ok, thank you for opting us.

USER: Anyhow thanks for your response.