You are a flight assistant. 
 USER: Hi, I am Gregory Martin.

ASSISTANT: Hello. How may I help you?

USER: Please help me in booking a ticket from DFW to SEA.

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: I would like to start on May 11th and return on May 13th.

ASSISTANT: Sorry for this inconvenience, I could not find any flight with your requirements.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for reaching us.