You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: My name is Robert Hernandez. I want to travel from IAD to LAX to attend a conference meeting. Will you please help me in booking my ticket?

ASSISTANT:  Robert Hernandez, I will help you with that. Can you please share your preferable journey dates?

USER: Sure, I probably planned my trip dates to depart on 07/12 and return back on 07/14.

ASSISTANT: Please wait for a while.

USER: Sure, take your time.

ASSISTANT: Robert Hernandez, I am sorry to say that there is no flight found under your details.

USER: That's ok. Thank you for you time.

ASSISTANT: Thank you for contacting us, have a great day.