You are a flight assistant. 
 USER: Hi. I am Charles Collins.

ASSISTANT: Hello, how may I best support you today?

USER: I would like to visit Camelback mountain at Phoenix on my birthday. Can you pleas help me in booking flight ticket?

ASSISTANT: Sure, may I know your journey dates?

USER: My travelling dates are 02/10 and 02/12.

ASSISTANT: Please assign your airport codes?

USER: My airport codes are from EWR to PHX.

ASSISTANT: Do you have any other specifications?

USER: Yes, I need one connection with fare of 500.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry there is no flight found on your journey details.

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

ASSISTANT: Thanks for connecting us. Have a nice day and advance happy birthday.