You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I would like to make a flight ticket reservation from LGA to DEN, can you please help me?

ASSISTANT: Sure, may I know the planned travel dates?

USER: Sure, my planned travelling dates are Jul, 14 and 16 respectively.

ASSISTANT: Please provide me the specifications.

USER: Yes, I would like to return at morning.

ASSISTANT: May I know the name?

USER: Sure, my name is Charles Robinson.

ASSISTANT: Sorry, there are no flights are available for your desired intent.

USER: Ok, not an issue.Thank you for your information.

ASSISTANT: Thank you for reaching us.