You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I help you?

USER: I would like to attend my brother's birthday party at Philadelphia, PA - PHL. Can you help me book a flight ticket for my round trip?

ASSISTANT: Sure, May I know the travel dates?

USER: I intend to fly on 05/22 and 05/24.

ASSISTANT: Can I get your name?

USER: My name is Cynthia Campbell.

ASSISTANT: Please wait a second.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: It's ok.

ASSISTANT: Thank you for reaching us.

USER: Thank you for the information.