You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Thomas Thomas here.

ASSISTANT: Can you please tell me how may I help you?

USER: I want to travel from HOU to AUS, can you help me to book a ticket? My travel dates are 12/27 and 12/29.

ASSISTANT: Sorry to say, no flights found on your details.

USER: It's ok.

ASSISTANT: Thank you for contacting us.

USER: Thank you.