You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Melissa Taylor.

ASSISTANT: How may I  help you?

USER: I am planning to visit Denver, can you please book me a ticket from EWR to DEN?

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

USER: My planned dates of journey are from 06/14 to 06/16.

ASSISTANT: Ok, please wait a minute.

USER: Ok, I will wait for your response.

ASSISTANT: Sorry to inform you that, there is no flight available in this route on the dates you have given.

USER: Ok, not an issue. I will find any alternate for this trip. Anyways, thank you for providing information.

ASSISTANT: Ok, thank you for your positive response. Have a nice day.