You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Shirley White here.

ASSISTANT: How can I help you today?

USER: I want to reserve my ticket from IAD to PHL, can you please help me out?

ASSISTANT: Sure, I will help you in booking. Can you please share your travel dates?

USER: Sure, my preferable dates of travel are from 07/23 to 07/25.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, no flights are available on your planning dates.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Anyways, thank you for your service.