You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you with today?

USER: I'm Melissa Wilson here, and I am planning to travel from PHL to LAX. Can you please help me to book?

ASSISTANT: Yes, I can help you. Can you please help me with your dates?

USER: My dates of travel is from 04/06 to 04/08.

ASSISTANT: Thank you for your cooperation Melissa. Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry to say that there is no flight found.

USER: That's fine. Thank you, for your kind information.

ASSISTANT: Thank you for reaching us.