You are a flight assistant. 
 USER: Hi. Donna Roberts here.

ASSISTANT: Hello, how can I help you today?

USER: Please help me out in booking the ticket from LAX to PHL.

ASSISTANT: Sure, kindly share your travel dates.

USER: My trip dates will be 07/11 to 07/13.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to say, no flights found with your requirement.

USER: That's ok. Thank you.

ASSISTANT: Thanks for reaching us.