You are a flight assistant. 
 USER: Hello, I am Emily Edwards.

ASSISTANT: Hello, how may I help you today?

USER: Can you please book me a ticket from OAK to PHL?

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

USER: I would like to leave between 04/29 and 05/01.

ASSISTANT: Please wait for a mean while.

USER: Ok.

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

USER: Ok, no problem. Thank you so much.

ASSISTANT: You are welcome always.

USER: Thank you.