You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Debra Phillips.

ASSISTANT: How can I assist you today?

USER: I have a conference meeting at Oakland. Can you please help me in reserving the ticket from AUS to OAK?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: I am planning my trip on Sept 21, and again I will return back on Sept 23.

ASSISTANT: Do you have any specifications?

USER: I am planning to return in the evening.

ASSISTANT: Do you have any other preferences?

USER: I am flexible with single connection.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no flights found under your preferable details.

USER: Not an issue, anyhow thank you very much for your service.

ASSISTANT: Welcome, have a great day.