You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: David Gonzalez here, I would like to travel from DFW to IAD, can you help me searching flights?

ASSISTANT: Sure, I will be helping you.That is my job to help you with booking. May I know your planned dates for this journey please?

USER: I am going to start my journey on 02/14 and I am going to return on 02/16.

ASSISTANT: May I know your good name please?

USER: I am David Gonzalez.

ASSISTANT: Sorry, there is no flight available for your requirement.

USER: Oh! it's ok, no problem.

ASSISTANT: David Gonzalez, have a great day.

USER: Thank you for your services.