You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Christine Martin.

ASSISTANT: How may I help you?

USER: I would like to book a ticket to Austin, can you please help me out?

ASSISTANT: Sure, can you please help me with travel dates?

USER: I am travelling on these dates 12/23 and 12/24.

ASSISTANT: Ok, which airports do you prefer to travel?

USER: I am flying from OAK to AUS.

ASSISTANT: Ok, please wait a minute.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you, there are no flight found in this route.

USER: Ok no problem, thank you for your valuable services.

ASSISTANT: Thank you for choosing us.