You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can i help you?

USER: I am Charles Johnson.

ASSISTANT: Ok.

USER: Actually I want to go outside with my family.Can you help me to book a ticket? My airport codes are DC-IAD to PA-PHL.

ASSISTANT: Sure, can you please tell your preferable dates of reservation Charles?

USER: These are my preferable dates 07/15 to 07/17?

ASSISTANT: Ok, wait a moment Charles.

USER: Ok.

ASSISTANT: yes, Charles you have flight matching your details.

USER: Ok, you can proceed.

ASSISTANT: Ok, your ticket has been booked. Thank you for connecting us.

USER: Thank you for your help.