You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Emma Phillips here.

ASSISTANT: How can I help you at this moment?

USER: I want to reserve my ticket, can you please help me to book a ticket from IAH to EWR?

ASSISTANT: Sure, I will help you with this. Can you please share your travelling dates?

USER: Sure, my dates of journey is from 04/20 to 04/22.

ASSISTANT: Give me a moment please.

USER: Sure.

ASSISTANT: Emma Phillips, there are no flights available on your requested dates.

USER: That's ok, thank you for your service.

ASSISTANT: Thank you for contacting us.