You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I'm Stephen Taylor.

ASSISTANT: How may I assist you?

USER: I have to join my friends in trekking at Oakland hills, can you please book me a ticket?

ASSISTANT: Sure, please help me with your travelling dates?

USER: Sure, my planned travel dates are 10/26 and 10/28.

ASSISTANT: May I know your airport codes?

USER: My source and destination codes are ATL and OAK.

ASSISTANT: There is a flight-1005 of Delta airlines is available for you, shall I poceed?

USER: Yes, please proceed.

ASSISTANT: Your booking is done.

USER: Thank you so much.

ASSISTANT: Have a nice journey. Welcome.