You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Alexander Gonzalez. I would like to travel from Denver to meet my childhood friend, can you please help me to book a flight ticket with single connection?

ASSISTANT: Help me with the travelling dates of journey.

USER: Sure, my journey dates are from 01/06 to 01/08.

ASSISTANT: May I know from where you what to travel?

USER: I am travelling from BOS-DEN.

ASSISTANT: Sorry, there is no flight on your requested dates.

USER: Ok, no issues.

ASSISTANT: Thank you for opting us.

USER: Thanks for your information.