You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am Elizabeth Walker. Can you please help me in booking a flight ticket to PHX from IAD?

ASSISTANT: Sure Walker, may I know your travelling dates of journey please?

USER: My travel dates are from Jun 07 and Jun 09.

ASSISTANT: Do you have any other specifications please?

USER: I would like to return in the afternoon. I do prefer to travel in connecting flight.

ASSISTANT: May I know your class preference please?

USER: I am comfortable with any class.

ASSISTANT: Please wait for a mean while.

USER: Ok.

ASSISTANT: Sorry Walker, there is no flight found as per your travelling details.

USER: Ok, no problem. Thank you.

ASSISTANT: You are welcome.