You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Elizabeth Thomas and I would like to head from Chicago, IL - ORD on 05/27 to Philadelphia, PA - PHL. Can you help me with that?

ASSISTANT: Sure, may I know further details?

USER: I will return on 05/29.

ASSISTANT: Please wait a minute, I will check and get back to you.

USER: Ok.

ASSISTANT: Sorry to inform that no flight is found with your details.

USER: Ok, thank you for your service.

ASSISTANT: Thanks for choosing us.