You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Helen Roberts here.

ASSISTANT: How may I guide you today?

USER: I want to reserve my ticket from DFW to EWR, can you please help me in this?

ASSISTANT: Sure, I will help you with that. Can you please mention your preferable journey dates?

USER: Sure, my planned dates of journey are from 05/30 to 06/01.

ASSISTANT: Please wait for a minute.

USER: Sure, I will wait.

ASSISTANT: I am sorry to say that there is no flight found under your name.

USER: Ok, no problem. Thank you for your service.

ASSISTANT: Thank you for contacting us.