You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Timothy Campbell here.

ASSISTANT: How may I help you?

USER: Can you book a flight ticket for my airport codes that is from AUS to SFO?

ASSISTANT: Can you share your trip dates?

USER: The travel dates are from Mar 08 to Mar 10.

ASSISTANT: Do you need any connections?

USER: I am looking for a direct flight.

ASSISTANT: Are there any other preferences?

USER: No.

ASSISTANT: Sorry to say that, there is no flight found with your details.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for reaching us.