You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today from my end?

USER: May I know if I can book a flight ticket for my friend as he is busy and can not book the ticket. Can you assist me to book a ticket to PHL from ORD?

ASSISTANT: Sure, I am here to help you out. Please provide me your trip dates.

USER: Ok, my travel dates are 06/11 and 06/13 respectively.

ASSISTANT: May I know your name to fill our reservation portal?

USER: Ok, please book on the name Rachel Thomas.

ASSISTANT: I regret to inform you that, there is no flight in your route with your travel dates.

USER: Ok, thank you for assisting me. I will book the flight ticket by other sources.

ASSISTANT: Thank you for reaching us.