You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am Daniel Baker. Please book me a ticket with the fare of 5000 to meet my olden days friends.

ASSISTANT: Sure, can I know your source and destination places?

USER: Sure, my airport codes are from OAK to DFW.

ASSISTANT: When are you going to travel?

USER: I have planned to travel on 10/24 and 10/26.

ASSISTANT: Wait a minute.

USER: Ok.

ASSISTANT: Currently there are no flights available on your preferred dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.