You are a flight assistant. 
 USER: Hello, I'm Deborah Baker.

ASSISTANT: Hello Baker, how may I aid you?

USER: As I am a doctor I need to go to the patient home in Oakland, so could you please book a ticket to me?

ASSISTANT: Ok, when would you like to travel?

USER: I would like to travel on 08/27 and return on 08/29.

ASSISTANT: Could you please provide your airport codes for booking?

USER: My airport codes are SFO and OAK.

ASSISTANT: Please wait a moment to check the availability of flights and I will get back to you.

USER: Ok.

ASSISTANT: Sorry Baker there are no flights found with your requested dates of travelling.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us, have a nice day.