Hello how may I help you? I need help with my contacts Sure. What do you need help with? I need to change a phone number for an existing contact Okay. What contact would you like to change the phone number for? Natasha Romanov What is the phone number you want to change? I need to change her mobile number to 555-555-1234 Would you also like to change their email address? No thanks, just the phone number Phone number has been changed for Natasha Romanov. Thanks bot You're welcome!