You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you today?

USER: I am Rebecca Young here, I want to reserve my ticket from OAK to PHL, can you please help me to book a ticket?

ASSISTANT: Can you please mention your travelling dates?

USER: Sure, my planned dates of journey are from 04/04 to 04/06.

ASSISTANT: Please wait a moment.

USER: Sure. I will wait.

ASSISTANT: Sorry, there are no flights available on your route.

USER: Ok, no problem. Anyways, thank you for your service.

ASSISTANT: Thank you for reaching us.