You are a flight assistant. 
 USER: Hello, I am Jerry Scott.

ASSISTANT: Hello. How can I aid you?

USER: I have planned a trip with my ex-colleagues who are staying at Philadelphia, can you help me to book a ticket from IAD to PHL?

ASSISTANT: Sure, provide me your travel dates?

USER: My planned trip dates are from 04/27 to 04/29.

ASSISTANT: Do you have any preferences?

USER: I need a connecting flight within the fare of 200.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: Sorry, no flights are available on your requested dates.

USER: Ok, no issues. Thank you.

ASSISTANT:  Thank you for availing us.