You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I serve you?

USER: I need to fly to Phoenix to treat an emergency case on 05/29 and I intend to return on 05/31. Can you please check the availability of flights?

ASSISTANT: Sure, may I know your connection limit?

USER: I need a direct flight.

ASSISTANT: Let me know your good name please.

USER: My name is David Evans.

ASSISTANT: Ok, can you please provide your airport codes?

USER: My airport codes are ORD-PHX.

ASSISTANT: Ok, please wait a while.

USER: Sure.

ASSISTANT: Thank you for waiting. There is no direct flight found with your specifications.

USER: Ok, no problem.

ASSISTANT: Thank you for opting us.

USER: Thank you for your information.