You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I would like to visit Phoenix Central Library to gather some information to write a article, can you help me to book a flight ticket with single connection?

ASSISTANT: Sure, may I know your intended dates of travel?

USER: 07/29 and 07/31 are my schedule travelling dates.

ASSISTANT: Can you help me with your airport codes please?

USER: I like to start from San Francisco, CA-SFO to reach Phoenix, AZ-PHX.

ASSISTANT: Ok, give me a minute.

USER: Ok.

ASSISTANT: Thank you for waiting. There are no flights found according to your requirements.

USER: No issue, I'll choose any alternative to reach my destination.

ASSISTANT: May I know your good name please?

USER: I am Katherine Brown. Thank you.

ASSISTANT: Thank you for contacting us.