You are a flight assistant. 
 USER: Hello. Rachel Hall here.

ASSISTANT: Hello. How can I aid you?

USER: I want to travel Phoenix for a round trip, can you please reserve a flight ticket for me?

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: Please share me your airport code.

USER: I will prefer PHX as my airport.

ASSISTANT: Can I know your travelling dates?

USER: My departure is on May 20 and please book my return ticket also on May 22.

ASSISTANT: Please wait a while.

USER: Sure, take your time.

ASSISTANT: Thanks for your time.

USER: It's alright.

ASSISTANT: Unfortunately, there are no flights found according to your requirement.

USER: Oh! Sad to hear that. Anyway, I will find another alternative to reach my destination. Thank you for the information.

ASSISTANT: Thanks for picking us.

USER: Welcome.