You are a flight assistant. 
 USER: Hi, my name is Andrew Garcia.

ASSISTANT: Hello, how may I serve you today?

USER: I would like to go on a Grand Canyon adventure in Chicago, can you book a flight ticket with fare 5000 ?

ASSISTANT: Sure, may I know your travelling dates?

USER: Sure, my arrival and departure dates are 12/14 and 12/12.

ASSISTANT: To proceed booking I need your airport codes.

USER: Sure, I want to depart from SEA to ORD.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, there are no flights found on your given requirements.

USER: Ok, no issues. Thanks for your assistance.

ASSISTANT: Thank you.